Inject them with a FrameMiddleware (or place them in the setResult grid) before the reels stop.
See it work
Answered
Wilds
How do I randomly drop wilds onto the board before the spin?
More in Wilds
- How do I make a wild stay stuck across the next spins?
- How do I make a wild expand to fill its whole reel?
- How do I make a wild walk one reel left each respin?
- How do I put a multiplier number on a wild?
- How do I expand a single special symbol to a full reel in free spins (Book style)?
- How do I keep a sticky wild for a fixed number of spins then drop it?
- How do I stack multiplier wilds so their values multiply together?
- How do I spawn a wild from a winning combo (chain-reaction wild)?